请介绍下CERNET网络建设情况，网络提供的服务有哪些?

高校一般有哪些应用?一般有几台服务器?应用的热点是什么?

金融行业一般有哪些应用?网络拓扑是怎么样的?金融行业的应用热点是什么?

IT业最近的技术热点是什么? 行业趋势是什么?厂商在里面起了什么作用.厂商该怎么办?

请你尽可能多的从高端到低端列出你说接触过的cisco 华为港湾锐睫的路由器.并说明其技术特点.

请问售前工程师在一个项目中起的作用.

请说出以太网的发展历程.并说明不同时段相关的IEEE的标准

请画出以太网数据包。IP包。TCP/UDP 包的结构.

请尽可能多的列出单播路由协议.并用一两句话描述它的特点.

请尽可能的多列出组播路由协议.并用一两句话描述它的特点.

防火墙技术有多少种.你用过的有哪些?它的特点是什么?

什么是IDS. IPS ?你用过的IDS设备有哪些?

三层交换机和路由器的区别?为什么不能用三层交换机代替路由器?

请说出你用过的操作系统.并说出他们的特点.

请说出你所用过的数据库.并说出他们的特点.

请描述下SDH技术.

请设计一条SQL 语句. 从一个表中查找字段为特定的数据.

阅读理解
    On the Internet, a packet monkey is someone who intentionally inundates a Web site or network with data packets, resulting in a denial-of-service situation. Packet monkeys typically use tools created and made available on the Internet by hackers. A packet monkey, unlike a script kiddy, leaves no clues as to who is making the exploit, making the identity of a packet monkey more difficult to trace. In addition, a denial-of-service attack can be launched on a wider scale than attacks performed by script kiddies, making them more difficult to investigate. Hackers look down on packet monkeys and often describe them as “bottom feeders.”Because a packet monkey uses tools created by others, the packet monkey has little understanding of the harm that may be caused. Typically, packet monkey exploits are random and without any purpose other than the thrill of making an effect.

linux系统有多少个级别，简述?

写出下列地址所处的网段地址，广播地址，以及有效地址的主机地址范围；
    170.16.10.5\25       10.10.10.5\30